I have Torterra on my team too, but I use it more for offense than defense. Well, actually it's about half-and-half. It has a couple support moves and a couple attack moves. I also used to use Gliscor, but I haven't lately.
Oh, and one thing I don't recommend: I once tried using a team made-up of Blissey, Rampardos, Shuckle, Alakazam, Ninjask, and Torterra. The first five are the highest non-legendary Pokemon in terms of HP, Attack, Defense and Special Defense, and Speed, respectively, so I thought it would turn out great. (Well, Alakazam isn't the king of Spec. Attack now since Chandelure came around.) It didn't go well at all.